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## Latency Numbers Every Programmer Should Know.md

      
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                klodoma
                / Latency Numbers Every Programmer Should Know.md
            
            
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              August 14, 2022 17:45
                — forked from sergekukharev/Latency Numbers Every Programmer Should Know.md
            
          
    Latency Comparison Numbers (~2012)


Name


L1 cache reference
0.5
ns


Branch mispredict
5
ns


L2 cachereference
7
ns


14x L1 cache


Mutex lock/unlock
25
ns


Main memory reference
100
ns


20x L2 cache, 200x L1 cache


Compress 1K bytes with Zippy
3,000
ns
3
us


~330MB/sec


## hex_md5.js
/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*
Name
L1 cache reference	0.5	ns
Branch mispredict	5	ns
L2 cachereference	7	ns			14x L1 cache
Mutex lock/unlock	25	ns
Main memory reference	100	ns			20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy	3,000	ns	3	us	~330MB/sec
	/*
	* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
	* Digest Algorithm, as defined in RFC 1321.
	* Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
	* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
	* Distributed under the BSD License
	* See http://pajhome.org.uk/crypt/md5 for more info.
	*/

	/*